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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #11  
Old 26th September 2022
Chuckthebeatertruck Chuckthebeatertruck is offline
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What you are describing is VERY common across all AM forks. Many people fit them anyways and then talk about "bent" shift forks when what they are actually seeing is the contact pattern.

Anyways, it's not uncommon when fitting AM forks to Andrews gears to have to grind. And you may be surprised at how poorly NOS forks do or do not fit. Loose is just as bad as tight here. I've tossed out more than one STD OEM fork because it was just way, way too loose on new gears.

The problem is that quality, genuine Harley forks dried up many moons ago. The NOS you see now are not the NOS of old. And by OLD, I'm talking more than 40 year old NOS parts, not more recent 1980s/90s "NOS" which are almost all re-branded aftermarket for bikes made in the previous generation (ie the EVO stuff was current production in the 90s but the ironhead stuff has already gone to AM because the demand was petering out).

Basically, for a lot of these parts, the pre 1980 stuff was still from the OEMs. Starting in the early 1980s, Drag Specialites, Screaming Eagle, and HD parts for ironheads slowly became identical, made in Taiwan, and not much better than Tedd/Vtwin aftermarket. Generally, Screaming Eagle or DS stuff made in S. Korea are good quality -- the Taiwan/ROC stuff is just as hit or miss as anything V twin puts out today.

The NOS Dixie/Superior forks (also made in Taiwan) tend to be "slightly" better made. BUT if you go over/undersize they are not consistent and may/may not get you to a value. Otherwise, I like them in STD and have used them across a few transmissions. The other half dozen I've done lately used "gently used" OEM forks. So far, no one, including me, is complaining about shift quality or missed shifts. Normally, I hear back: "I don't even think about the transmission" which is EXACTLY what I'm aiming for.

In other words, this is one of those times when there's a difference between NOS and NOS. Both are new old stock . . .but only one of them is what you actually want.

Then, make sure the top hats actually fit the pins on the forks. You'd be surprised at how screwed up this can be . . .and how much the forks can then cock in the cam plate. And, no, simply fitting ground down big twin top hats won't do it -- the problem is the poor quality control of many forks and the fact many people think the top hats should fit very loosely.

Ditto on the fit of the fork to the sliding shaft -- it must be good and the shaft must be well anchored at the trap door for everything to perform as it should.

It's amazing how wear or poor fit in these areas can lead to all sorts of other problems. Usually, on a stock bike you can "work around" shifting issues - on a stroker you can find yourself with a trail of tears.
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  #12  
Old 26th September 2022
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rocketnorton rocketnorton is offline
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hopefully the fork from member here will do
i have one decent one here, brass, std

got 2 steels that look like same casting as brass ones
they are + & - .020 tho

if anyone needs, id pass m along for ship cost
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